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Multiple low pressure systems have hit the North American West Coast over the past week. The latest system is set to bring an impactful atmospheric river event to parts of the Pacific Northwest.
Atmospheric rivers are classified by extensive rain, which soaked the Pacific Northwest alongside unseasonably warm temperatures and river flooding.
The U.S Coast Guard had to rescue five people from flooded areas around Portland, Oregon on Dec. 3. Another rescue had to be performed in southwest Washington, after four feet of water submerged his house.
Parts of Washington, including Seattle, Forks and Hoquaim received their highest rainfall on record for the season, with 1.5 inches of rain falling in Seattle.
A small landslide caused closures to a trail outside Seattle, and rivers also experienced extensive flooding in Washington and Oregon.
Visit the National Weather Service for more forecast details.
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Description:
This multi-day time lapse shows the full evolution of the low pressure system and resulting atmospheric river in the Pacific Northwest.
Phenomena: Atmospheric Rivers Flooding Mid-latitude Cyclones
Satellite: GOES-18
Product: Water Vapor (band 9)
Instrument: ABI
In the Gulf of Alaska, polar-orbiting satellites captured small swirls inside of the low-pressure that brought the plume of moisture to the PNW.
Phenomena: Atmospheric Rivers Mid-latitude Cyclones
Satellite: NOAA-20 NOAA-21 S-NPP
Product: Visible (I1)
Instrument: VIIRS
Multiple systems across the Pacific Ocean continue to feed moisture into the West Coast. Heavy rain is expected across northern California and western Oregon for the next few days.
Phenomena: Atmospheric Rivers
Product: Airmass (EUMETSAT)
The risk of flash flooding and river flooding stricken the region as multiple inches of precipitation fall in a short period of time.
Product: Infrared (band 13)
A large mid-latitude cyclone in the North Pacific briefly reveals itself in the winter sun.
Product: Visible (band 2)
A plume of moisture is being directed at the Pacific Northwest by a deep upper-level trough. Heavy rainfall and instances of flooding are expected in areas of Washington, Oregon, and Northern California over the next few days.
Product: GeoColor
A high impact atmospheric river approaches the Pacific Northwest.
An impressive low pressure system swirls over the North Pacific as it approaches the Pacific Northwest coast.
A string of low pressure systems approach the North American West Coast.
Phenomena: Mid-latitude Cyclones
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